Free Online Developer Tools

Free online developer tools for formatting, validating, comparing, converting, encoding, decoding, and inspecting developer data. Everything processes securely and locally in your browser.

JSON Tools

4 tools

Pretty Print

Format JSON with readable indentation.

Minify

Compress JSON into a single line.

Validate

Check if JSON is valid without modifying it.

JSON → YAML

Convert JSON to YAML format.

XML Tools

3 tools

Pretty Print

Format XML with readable indentation.

Minify

Compress XML by removing whitespace.

Validate

Check if XML is well-formed.

SQL Tools

3 tools

Pretty Print

Format SQL queries for readability.

Minify

Compress SQL queries into a single line.

Validate

Check SQL query syntax validity.

Text Tools

3 tools

Compare

Compare two text blocks to see if they are identical.

Diff

Visualize the differences between two texts.

Line Counter

Count lines, words, and characters.

Encoding Tools

3 tools

Base64

Encode and decode Base64 strings.

URL Encode

Encode text for safe inclusion in a URL.

URL Decode

Decode URL-encoded text.

Other Tools

8 tools

Time Duration Converter

Convert between time units and format durations.

Cron Generator

Create and parse cron expressions (Spring/Quartz).

QR Code

Read and generate QR codes.

Password Generator

Generate strong, secure passwords locally.

Password Hash

Hash passwords with modern algorithms (Bcrypt, Argon2, Scrypt).

JWT Decoder

Decode and inspect JSON Web Tokens locally.

UUID Generator

Generate version 4 UUIDs.

Timestamp Converter

Convert between Unix timestamps and readable dates.